That's the reason so many licenses are in existence. It's OK for you to allow anybody to use your work for whatever usage. However, not everybody thinks the same and even the same person could license a single work over a non permissive license.
Also, please notice that if there is no license explicitly stated, then nobody can use that work without permission.
Agreeable since we're still living with regulations even when it comes to free information on the internet. What do you think about popular meme images in this case?